Indoor unit for air conditioning device

ABSTRACT

There is provided an indoor unit for an air conditioning device enabling thinning of a body case. The indoor unit is an indoor unit for an air conditioning device in which a fan and an electric component box are provided inside a body case installed in a ceiling, and a control board to control electric parts including the fan is contained in this electric component box, wherein an opening for maintenance is provided in a lower surface of the electric component box, and the control board is arranged at a slant with respect to a vertical direction so that a mounting surface in the control board is arranged obliquely downward.

TECHNICAL FIELD

The present invention relates to an indoor unit for an air conditioningdevice.

BACKGROUND ART

In Patent Literature 1 mentioned below, there has been disclosed an airconditioning device including a ceiling embedded type indoor unitcontained inside a ceiling. This indoor unit includes a decorative panelin a lower surface of a box-shaped body case, and in this decorativepanel, an inlet port and an outlet port of air are provided. An insideof the body case is divided into a machine chamber and a heat exchangechamber by a partition plate, in the machine chamber, a fan unit isarranged, and in the heat exchange chamber, a heat exchanger, a drainpan, a drain pump and the like are arranged. Air sucked from the inletport by the fan unit is blown from the outlet port after being subjectedto heat exchange with the heat exchanger to adjust indoor temperatureand humidity.

Moreover, in the machine chamber inside the body case, there is providedan electric component box containing a control board that controlselectric parts such as the fan unit and the drain pump, a terminal blockand the like.

CITATION LIST Patent Literature

Patent Literature 1: Japanese Unexamined Patent Publication No.2006-97995

SUMMARY OF INVENTION Technical Problem

Since the body case in the ceiling embedded type indoor unit is arrangedin a narrow space inside the ceiling, it is desired to make the bodycase as thin as possible. Moreover, not only the thinning of the ceilingembedded type, but also the thinning of an indoor unit installed on aceiling lower surface is desired.

In the indoor unit described in Patent Literature 1, the control boardand the terminal block inside the electric component box are arrangedside by side, and the control board is arranged in a state where longsides thereof are lateral (horizontal). This can make a height dimensionof the electric component box small, thereby contributing to thethinning of the body case.

However, in the above-described arrangement, since a lateral dimensionof the electric component box becomes larger, the electric component boxcannot help being arranged between the fan unit and a back wall of thebody case in a front-back direction with a longitudinal direction of theelectric component box set along a longitudinal direction of the bodycase. Although this enables the thinning of the body case, there is adisadvantage that a depth dimension (in the front-back direction)becomes larger.

An object of the present invention is to provide an indoor unit for anair conditioning device that can make a height dimension of an electriccomponent box small to achieve thinning of a body case without arranginglong sides of a control board horizontally.

Solution to Problem

The present invention is an indoor unit for an air conditioning devicein which a fan and an electric component box are provided inside a bodycase installed in a ceiling, and a control board to control electricparts including the fan is contained in this electric component box,wherein an opening for maintenance is provided in a lower surface of theelectric component box, and the control board is arranged at a slantwith respect to a vertical direction so that a mounting surface in thecontrol board is arranged obliquely downward.

According to this configuration, a height dimension of the control boardcan be made as small as possible without arranging long sides of thecontrol board laterally (horizontally). This can also make small aheight dimension of the electric component box containing this controlboard, which enables thinning of the body case. Moreover, since the longsides of the control board need not be lateral, a lateral dimension ofthe electric component box can also be made small, which increases afreedom degree of an arrangement location of the electric component box.Furthermore, since the mounting surface of the control board is arrangedobliquely downward, inspection and the like of the control board can beeasily performed through the opening.

A longitudinal dimension of the control board may be larger than aheight dimension of the body case.

Even when the longitudinal dimension of the control board is larger thanthe height dimension of the body case in this manner, the slantarrangement of the control board with respect to the vertical directionallows the control board to be appropriately contained in the body casein a state where the long sides of the control board are arrangedlongitudinally (in a direction crossing the horizontal).

It is preferable that a terminal block is contained detachably insidethe electric component box, and that this terminal block is arranged soas to overlap a planar region of the control board within a range of aheight of the control board.

The above-described configuration enables the control board and theterminal block to be arranged compactly, and the electric component boxto be downsized.

It is preferable that a weak current circuit is provided on a lower sidein the mounting surface of the control board, and that a strong currentcircuit is provided on an upper side therein.

Generally, since in many cases, electric parts each having a loweroperating voltage (weak current parts) have high maintenance frequency,and electric parts each having a high operating voltage (strong currentparts) have lower maintenance frequency, the weak current circuitcontrolling the weak current part is mounted on the lower side close tothe opening for maintenance, which can enhance maintenance performance.

It is preferable that the control board is fixed to the electriccomponent box by a screw in at least one side, and is locked to theelectric component box in at least other two sides.

The above-described configuration can prevent the control board fromfloating up with respect to the electric component box, when vibrationin a direction perpendicular to a plate surface of the control board isapplied.

Advantageous Effects of Invention

According to the present invention, the height dimension of the electriccomponent box can be made small without arranging the long sides of thecontrol board laterally, and the thinning of the body case in which thiselectric component box is provided can be achieved.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a configuration view of an air conditioning device in oneembodiment of the present invention.

FIG. 2 is a side cross-sectional view showing an indoor unit for the airconditioning device (a cross-sectional view viewed from arrow of A-A inFIG. 3).

FIG. 3 is an explanatory plan view of the indoor unit.

FIG. 4 is a front view of the indoor unit.

FIG. 5 is a bottom view of the indoor unit.

FIG. 6 is a side cross-sectional view (a cross-sectional view viewedfrom arrow of B-B in FIG. 3) of the indoor unit.

FIG. 7 is a side view of an electric component unit.

FIG. 8 is a bottom view of the electric component unit.

FIG. 9 is a side cross-sectional view of the electric component unit.

FIG. 10 is a cross-sectional view showing an attachment structure of aterminal block.

FIG. 11 is a perspective view showing an attachment structure on a lowerside of the control board.

FIG. 12 is a perspective view showing an attachment structure on anupper side of the control board.

DESCRIPTION OF EMBODIMENTS

Hereinafter, an embodiment of the present invention will be describedwith reference to the drawings.

FIG. 1 is a configuration view of an air conditioning device accordingto one embodiment of the present invention. This air conditioning device10 includes an indoor unit (a utilization-side unit) 11 and an outdoorunit (a heat source-side unit) 12.

In the outdoor unit 12, a compressor 14, a four way valve 18, an outdoorheat exchanger 15, an outdoor expansion valve 16 and the like areprovided, and these are connected by a refrigerant pipe 25. Moreover, inthe outdoor unit 12, an outdoor fan 20 is provided.

At terminal portions of an inside refrigerant circuit of the outdoorunit 12, a gas side stop valve 22 and a liquid side stop valve 23 areprovided. The gas side stop valve 22 is arranged on a four way valve 18side, and the liquid side stop valve 23 is arranged on an outdoorexpansion valve 16 side.

In the indoor unit 11, an indoor expansion valve 28, an indoor heatexchanger 13 and the like are provided. The gas side stop valve 22 andthe indoor heat exchanger 13 are connected by a gas side refrigerantcommunication pipe 24, and the liquid side stop valve 23 and the indoorexpansion valve 28 are connected by a liquid side refrigerantcommunication pipe 26.

In the air conditioning device 10 having the above-describedconfiguration, when cooling operation is performed, the four way valve18 is held in a state indicated by solid line in FIG. 1. As indicated bysolid arrow, a high-temperature, high-pressure gassy refrigerantdischarged from the compressor 14 flows into the outdoor heat exchanger15 via the four way valve 18, and exchanges heat with outdoor air byactivation of the outdoor fan 20 to be condensed/liquefied. Theliquefied refrigerant passes through the outdoor expansion valve 16 inan almost fully open state, and flows into the indoor unit 11 throughthe liquid side refrigerant communication pipe 26. In the indoor unit11, the refrigerant is decompressed to a predetermined low pressure bythe indoor expansion valve 28, and further exchanges heat with theindoor air in the indoor heat exchanger 13 to evaporate. The indoor aircooled by the evaporation of the refrigerant is blown into a room by anindoor fan 19 to cool the room. Moreover, the refrigerant, which hasevaporated in the indoor heat exchanger 13, returns to the outdoor unit12 through the gas side refrigerant communication pipe 24, and is suckedinto the compressor 14 via the four way valve 18.

On the other hand, when heating operating is performed, the four wayvalve 18 is held in a state indicated by dashed line in FIG. 1. Asindicated by dotted arrow, the high-temperature, high-pressure gassyrefrigerant discharged from the compressor 14 flows into the indoor heatexchanger 13 of the indoor unit 11 via the four way valve 18, andexchanges heat with the indoor air to be condensed/liquefied. The indoorair heated by the condensation of the refrigerant is blown into the roomby the indoor fan 19 to heat the room. The refrigerant liquefied in theindoor heat exchanger 13 returns to the outdoor unit 12 from the indoorexpansion valve 28 in an almost fully open state through the liquid siderefrigerant communication pipe 26. The refrigerant, which has returnedto the outdoor unit 12, is decompressed to a predetermined low pressurein the outdoor expansion valve 16, and exchanges heat with the outdoorair in the outdoor heat exchanger 15 to evaporate. The refrigerant,which has evaporated in the outdoor heat exchanger 15, is sucked intothe compressor 14 via the four way valve 18.

FIG. 2 is a side cross-sectional view (a cross-sectional view viewedfrom arrow of A-A in FIG. 3) showing the indoor unit 11 of the airconditioning device 10, FIG. 3 is a plane cross-sectional view of theindoor unit 11, FIG. 4 is a front view of the indoor unit 11, and FIG. 5is a bottom view of the indoor unit 11.

The indoor unit 11 is a ceiling embedded type indoor unit installed inan indoor ceiling space or the like, and includes a body case 31, adecorative panel 32, the indoor fan 19, and the indoor heat exchanger13, a drain pan 33 and the like.

The body case 31 is made up of a square upper wall portion 35 in planview, and four circumferential wall portions extending downward fromfour sides of this upper wall portion 35 (a front wall portion 36, aback wall portion 37, a left wall portion 38, and a right wall portion39) to be formed into a box shape open downward. The decorative panel 32is attached to an opening portion at a lower end in the body case 31. Asshown in FIG. 4, the body case 31 is hung through hanging bolts 40 froma lower surface of an upper floor above a ceiling 30, or the like, andthe decorative panel 32 is arranged along a lower surface of the ceiling30.

As shown in FIGS. 2 and 3, an inside of the body case 31 is divided intoa fan chamber 43 and a heat exchange chamber 44 by a partition plate 42.In the present description, a fan chamber 43 side is a back side, and aheat exchange chamber 44 side is a front side.

The decorative panel 32 includes an inlet port 45 below the fan chamber43, and an outlet port 46 on the front side below the heat exchangechamber 44. A grid-shaped grill 47 is attached to the inlet port 45, andin the outlet port 46, a wind guide plate 48 that adjusts a blowingdirection of the air is provided swingably.

As shown in FIG. 3, in the fan chamber 43, the two indoor fans 19 arespaced in a right-left direction. An electric motor 50 is arrangedbetween the two indoor fans 19, and both the indoor fans 19 are drivenby this electric motor 50. The indoor fans 19 of the present embodimentare each a sirocco fan made up of a substantially cylindrical casing 19a and an impeller 19 b provided inside this casing 19 a, as shown inFIG. 2. In a side surface of the casing 19 a, an inlet port 19 a 1 isformed, and an outlet port 19 a 2 is projected forward in a frontportion of the casing 19 a. The outlet port 19 a 2 is inserted into anopening formed in the partition plate 42 in a sealed state.

When the indoor fans 19 are activated, the indoor air is taken into thefan chamber 43 from the inlet port 45, and is sucked into the inletports 19 a 1 of the casings 19 a, and then, is blown into the heatexchange chamber 44 from the outlet ports 19 a 2. Accordingly, a spaceinside the fan chamber 43 is a suction space into which the air issucked by the indoor fans 19, and a space of the heat exchange chamber44 is a blowing space into which the air is blown by the indoor fans 19.

In the heat exchange chamber 44, the indoor heat exchanger 13 isarranged. The indoor heat exchanger 13 is, for example, a cross fin typefin-and-tube heat exchanger including a number of fins arranged side byside at predetermined intervals in the right-left direction, and heattransfer tubes provided so as to penetrate these fins. This indoor heatexchanger 13 is arranged at a slant so that an upper portion thereof islocated in the front side (on the outlet port 46 side; a downstream sideof an air flow) and a lower portion thereof is located on the back side(the indoor fan 19 side; an upstream side of the air flow). The airblown from the indoor fans 19 into the heat exchange chamber 44 issubjected to heat exchange with the indoor heat exchanger 13, and isthen blown from the outlet port 46 into the room. The drain pan 33 isprovided below the indoor heat exchanger 13, so that dew generated inthe indoor heat exchanger 13 is received by the drain pan 33.

The drain pan 33 is formed of a material having high adiabaticity suchas expanded polystyrene and the like, and functions as a heat insulatoras well. Moreover, as shown in FIGS. 1 and 3, in inner surfaces of theupper wall portion 35, the front wall portion 36, and the left and theright wall portions 38, 39 of the body case 31 in the heat exchangechamber 44, heat insulators 54 to 57 respectively made of expandedpolystyrene or the like are provided.

FIG. 6 is a side cross-sectional view (a cross-sectional view viewedfrom arrow of B-B in FIG. 3) of the indoor unit. As shown in FIGS. 3 and6, an electric component unit 58 is arranged in a right end portion ofthe fan chamber 43. This electric component unit 58 is made up of anelectric component box 59, and a control board 60, a terminal block 61and the like which are contained in this electric component box 59.Moreover, in a right end portion of the heat exchange chamber 44, apiping group 62 of a flow divider, a header and the like connected tothe indoor heat exchanger 13, and electric parts such as a drain pump63, the indoor expansion valve 28, a thermistor and the like arearranged. Electric wiring 64 of these electric parts are connected tothe electric component unit 58 through the partition plate 42 from theheat exchange chamber 44.

As shown in FIG. 6, the drain pump 63 discharges the dew stored in thedrain pan 33 outside by activating a built-in motor (actuator). Thedrain pump 63 is attached and fixed to the upper wall portion 35 of thebody case 31 through a mount (an attachment member) 66. Moreover, afloat sensor 65 is also attached to the mount 66. The drain pump 63 andthe float sensor 65 are assembled as one unit by a coupling frame 67.

The mount 66 is formed into a U shape in side view by front and back legplates 69 and a sole plate 70 connecting lower end portions of both theleg plates 69. At an upper end portion of each of the leg plates 69, afixing piece 71 bent substantially at a right angle is provided, andthis fixing piece 71 is fixed to the upper wall portion 35.

In the coupling frame 67, the electric wiring 64 of the indoor expansionvalve 28, guide claws 68 that guide the electric wiring of thethermistor, and the like are formed integrally. The electric wiring 64is supported by these guide claws 68 so as to prevent the electricwiring 64 from hanging down on a drain pan 33 side.

FIG. 7 is a side view of the electric component unit, FIG. 8 is a bottomview of the electric component unit, and FIG. 9 is a sidecross-sectional view of the electric component unit. In FIGS. 7 and 8,“front” and “back” are indicated, corresponding to the descriptions of“front” and “back” indicated in FIGS. 2 to 6.

The electric component box 59 of the electric component unit 58 isformed with an opening 72 for maintenance in a lower surface and oneside surface (side surface on the fan 19 side) thereof. This opening 72is closed by a lid body 73 bent into a substantial L shape. This lidbody 73 is attached detachably by screws (not shown) to be screwed intofemale screw holes 59 a provided in the lower surface of the electriccomponent box 59.

As shown in FIG. 6 as well, the electric component box 59 is arranged sothat an upper portion 74 a side of a front wall 74 opposed to thepartition plate 42 is arranged substantially parallel to, behind, and ata distance from the partition plate 42, and a lower portion 74 b side isarranged substantially parallel to, and at a position close to thepartition plate 42. An inclined portion 74 c, which is inclined so thata front thereof descends, is provided between the upper portion 74 a andthe lower portion 74 b of the front wall 74. This shape of the frontwall 74 allows a recess 75 recessed backward to be formed in front ofthe electric component box 59.

As shown in FIGS. 7 to 9, inside the electric component box 59, thecontrol board 60 and the terminal block 61 are provided. The controlboard 60 is to control operation of the electric parts inside the indoorunit 11, for example, the fans 19 (the motor 50), the drain pump 63, thefloat sensor 65, the indoor expansion valve 28 and the like (refer toFIGS. 3 and 5), to which the electric wiring of the respective electricparts are connected. To the terminal block 61, electric wiring drawninto the indoor unit 11 from the outside is connected.

The control board 60 is a unit component made up of a board body 80making up a substantive electric circuit, and a case 81 protecting thisboard body 80. The board body 80 is made of a printed board that isprovided with circuit wiring made of a conductor on a rectangularinsulating plate made of a synthetic resin to mount various electricparts, and the like. The case 81 is made of a rectangular thin tray madeof an insulator such as a synthetic resin and the like, and covering aback surface and outer circumferential surfaces excluding a mountingsurface (front surface) 80 a of the board body 80.

The control board 60 is attached to the electric component box 59 in aposture inclined with respect to a vertical direction (upper-lowerdirection). Specifically, the control board 60 is arranged so that shortsides 60 a of the rectangle extend along a right-left horizontaldirection, and long sides 60 b are oblique to the front-back directionand the upper-lower direction. Moreover, the mounting surface 80 a ofthe board body 80 is directed obliquely backward and downward. Thecontrol board 60 is arranged on an almost diagonal line connecting aback upper corner portion and a front lower corner portion of theelectric component box 59. A back surface (upper surface) of the controlboard 60 is arranged along a lower surface of the inclined portion 74 cin the electric component box 59. An inclination angle of the controlboard 60 can be set to, for example, 30° to 50° with respect to ahorizontal plane, and preferably, about 40°.

FIG. 11 is a perspective view showing an attachment structure on a lowerside of the control board 60, and FIG. 12 is a perspective view showingan attachment structure on an upper side of the control board 60.

In the case 81 of the control board 60, a plurality of locking pieces82, 83 are provided. Specifically, on a lower side of one side of thecase 81, the side locking piece 82 bent into a substantial L shape isprovided. Moreover, the two upper locking pieces 83 are provided in anupper side of the case 81. In response to this, in the inclined portion74 c in the electric component box 59, a side locking hole 84 in whichthe side locking piece 82 can be locked is formed, and in a back endportion in the upper portion of the electric component box 59, upperlocking holes 85 in which the upper locking pieces 83 can be locked areformed.

The side locking hole 84 is formed to be longer in the front-backdirection than the side locking piece 82, so that the side locking piece82 can be moved back and forth in a state locked in the side lockinghole 84. Accordingly, the control board 60 can be slid obliquely upwardalong the inclined portion 74 c in the state where the side lockingpiece 82 is locked in the side locking hole 84 to lock the upper lockingpieces 83 in the upper locking holes 85. Moreover, on the other side ofthe case 81 on the opposite side of the side locking piece 82, anattachment piece 86 formed with a screw insertion hole 86 a isprotruded, and in the inclined portion 74 c of the electric componentbox 59, a female screw hole 87 is formed. A screw 88 inserted into thescrew insertion hole 86 a is screwed into the female screw hole 87 in astate where the respective locking pieces 82, 83 of the case 81 arelocked in the respective locking holes 84, 85 of the electric componentbox 59, by which the control board 60 is attached to the electriccomponent box 59.

In this manner, the two sides of the control board 60 are locked to theelectric component box 59, and the other side is fixed to the electriccomponent box 59 by the screw 88, by which the three sides excluding alower side are supported by the electric component box 59. This allowsthe control board 60 to be supported stably with respect to a directionperpendicular to the control board 60, thereby preventing the controlboard 60 from floating up from the electric component box 59 due tovibration or the like. Moreover, detachment of the one screw 88 enablesthe control board 60 to be easily detached from the electric componentbox 59.

As described above, in the present embodiment since the control board 60is inclined with respect to the vertical direction, a height dimensionof the electric component box 59 can be made smaller as compared with acase where the control board 60 is arranged parallel to the verticaldirection, so that thinning of the body case 31 containing this electriccomponent box 59 can be achieved.

Moreover, in the present embodiment, as compared with a case where thecontrol board 60 is arranged perpendicular to the vertical direction(arranged in the front-back horizontal direction), a width in thefront-back direction of the electric component box 59 can be madesmaller. Furthermore, in the control board 60, since the short sides 60a are arranged in the right-left direction, a width in the right-leftdirection of the electric component box 59 can also be made smaller.

Accordingly, in the present embodiment, upper-lower, front-back, andright-left dimensions of the electric component box 59 can be madesmaller with balance, and a freedom degree of the arrangement of theelectric component box 59 can be increased. Specifically, in the presentembodiment, the electric component box 59 can be preferably contained inan empty space 31 a (refer to FIG. 3) formed in an end portion in theright-left direction of the fan chamber 43. The above-describedarrangement of the electric component box 59 prevents a dimension in thefront-back direction (depth) of the body case 31 from increasing.

Since in the control board 60, the mounting surface 80 a of the boardbody 80 is arranged obliquely backward and downward, inspection andmanipulation (attachment/detachment of the electric wiring and the like)can be easily performed through the opening 72 for maintenance in thelower surface of the electric component box 59.

As shown in FIG. 9, in the board body 80 in the control board 60, a weakcurrent circuit 80 b to drive and control the electric parts activatedat a low voltage (e.g., lower than 50 V (20 V or the like)) is providedon a lower side close to the opening 72 of the electric component box59, and a strong current circuit 80 c to drive and control the electricparts activated at a high voltage (e.g., 50 V or higher (200 V or thelike)) is provided on an upper side of the board body 80. For example,the drain pump 63, the indoor expansion valve 28 and the like are drivenand controlled by the weak current circuit 80 b, and the fans 19 aredriven and controlled by the strong current circuit 80 c. Moreover, theelectric wiring (signal lines) of the float sensor 65, the thermistor, aremote controller, and the like is also connected to the weak currentcircuit 80 b.

A plurality of connection ports (connectors) 80 d are provided at alowermost portion of the mounting surface 80 a, and to these connectionports 80 d, the electric wiring of the drain pump 63, the float sensor65, the thermistor, the indoor expansion valve 28 and the like insidethe heat exchange chamber 44 is detachably connected. Moreover, on aside surface of the electric component box 59, a plurality of cableentrances 59 d to draw electric wiring are provided.

Generally, in many cases, weak current parts such as instruments eachhaving a low operating voltage such as the indoor expansion valve 28 andthe like, and a sensor and the like have higher frequency of maintenancesuch as part exchange and the like, while strong current parts eachhaving a high operating voltage such as the fans 19 and the like havethe lower frequency of the maintenance as compared with the weak currentparts. Therefore, as in the present embodiment, the weak current circuit80 b that drives and controls the weak current parts is mounted on thelower side of the mounting surface 80 a, which is close to the opening72 for maintenance, so that maintenance performance can be enhanced. Onthe other hand, since the strong current circuit 80 c is provided on theupper side of the mounting surface 80 a, worker's hand, a foreignsubstance or the like can be prevented from contacting the strongcurrent circuit 80 c during the maintenance of the weak current circuit80 b.

Moreover, as shown in FIG. 9, inside the electric component box 59, areverse side (upper side) of the weak current circuit 80 b in thecontrol board 60 is supported in contact with the inclined portion 74 c,while on a reverse side (upper side) of the strong current circuit 80 c,a space 59 c is provided. This makes it difficult to enclose heatgenerated in the strong current circuit 80 c inside the electriccomponent box 59, which can reduce thermal effects on the control board60.

FIG. 10 is a cross-sectional view showing an attachment structure of theterminal block 61.

As shown in FIGS. 7, 9, 10, the terminal block 61 is attached to oneside wall of the electric component box 59 through an attachment bracket90. The attachment bracket 90 is made up of an upper leg portion 90 a, alower leg portion 90 b, and a base plate portion 90 c provided betweenboth the leg portions. The upper leg portion 90 a is locked in latchportions 59 b formed by cutting and raising portions of the side wall ofthe electric component box 59. In the lower leg portion 90 b, a screwinsertion hole 90 d is formed, and a screw 91 inserted into this screwinsertion hole 90 d is screwed into a female screw hole 59 c formed inthe side wall of the electric component box 59 to thereby fix the lowerleg portion 90 b. The base plate portion 90 c is arranged obliquelydownward in the right-left direction, and the terminal block 61 is fixedto a surface thereof by screws or the like.

The terminal block 61 is arranged within a range of a height of thecontrol board 60, as shown in FIG. 7, and is arranged within a range inthe front-back direction and in the right-left direction (within aplanar region) of the control board 60, as shown in FIG. 8. Accordingly,the control board 60 and the terminal block 61 can be arranged insidethe electric component box 59 compactly.

Moreover, the terminal block 61 can be detached from the electriccomponent box 59 together with the attachment bracket 90 by detachingthe screw 91. Therefore, when the maintenance of the control board 60 isperformed, detaching the terminal block 61 together with the attachmentbracket 90 can prevent the terminal block 61 from being impeditive.Moreover, with the attachment bracket 90, since only the lower legportion 90 b is fixed by the screw 91, and the upper leg portion 90 a isonly locked to the electric component box 59, the attachment bracket 90can be detached from the electric component box 59 easily and quickly.

The present invention is not limited to the above-described embodiment,but can be modified within the scope of the invention described inclaims as needed.

For example, the control board 60 inside the electric component box 59does not include the case 81, but may be made up of only the board body80. Moreover, while in the control board 60, the mounting surface 80 ais arranged obliquely backward and downward, it may be arrangedobliquely forward and downward, or obliquely rightward or leftward, anddownward. The control board 60 may be fixed to the electric componentbox 59 by two or more screws.

The whole of the terminal block 61 need not be arranged within theplanar region of the control board 60, but at least a part of theterminal block 61 only needs to be arranged (overlapped) in the relevantplanar region.

The present invention can be applied not only to the ceiling embeddedtype indoor unit 11 but also to a hanging type indoor unit.

REFERENCE SIGNS LIST

-   -   10: AIR CONDITIONING DEVICE    -   11: INDOOR UNIT    -   19: INDOOR FAN    -   28: INDOOR EXPANSION VALVE    -   30: CEILING    -   31: BODY CASE    -   50: MOTOR OF FAN    -   58: ELECTRIC COMPONENT UNIT    -   59: ELECTRIC COMPONENT BOX    -   60: CONTROL BOARD    -   61: TERMINAL BLOCK    -   64: ELECTRIC WIRING    -   65: FLOAT SENSOR    -   72: OPENING FOR MAINTENANCE    -   80: BOARD BODY    -   80 a: MOUNTING SURFACE    -   80 b: WEAK CURRENT CIRCUIT    -   80 c: STRONG CURRENT CIRCUIT    -   81: CASE    -   82: SIDE LOCKING PIECE    -   83: UPPER LOCKING PIECE    -   84: SIDE LOCKING HOLE    -   85: UPPER LOCKING HOLE

1-5. (canceled)
 6. An indoor unit for an air conditioning device inwhich a fan and an electric component box are provided inside a bodycase installed in a ceiling, and a control board to control electricparts including the fan is contained in the electric component box,wherein an opening for maintenance is provided in a lower surface of theelectric component box, the control board is arranged at a slant withrespect to a vertical direction so that a mounting surface in thecontrol board is arranged obliquely downward, a terminal block iscontained detachably inside the electric component box, and the terminalblock is arranged so as to overlap a planar region of the control boardwithin a range of a height of the control board.
 7. An indoor unit foran air conditioning device in which a fan and an electric component boxare provided inside a body case installed in a ceiling, and a controlboard to control electric parts including the fan is contained in theelectric component box, wherein an opening for maintenance is providedin a lower surface of the electric component box, the control board isarranged at a slant with respect to a vertical direction so that amounting surface in the control board is arranged obliquely downward, aweak current circuit is provided on a lower side in the mounting surfaceof the control board, and a strong current circuit is provided on anupper side therein.
 8. The indoor unit for an air conditioning deviceaccording to claim 6, wherein a longitudinal dimension of the controlboard is larger than a height dimension of the body case.
 9. The indoorunit for an air conditioning device according to claim 7, wherein alongitudinal dimension of the control board is larger than a heightdimension of the body case.
 10. The indoor unit for an air conditioningdevice according to claim 6, wherein the control board is fixed to theelectric component box by a screw in at least one side, and is locked tothe electric component box in at least other two sides.
 11. The indoorunit for an air conditioning device according to claim 7, wherein thecontrol board is fixed to the electric component box by a screw in atleast one side, and is locked to the electric component box in at leastother two sides.